December 2025 - Avo-usgs - list.avo.alaska.edu

[AVO-OPS] AVO RSDB- 19 Dec 2025 satellite report
by Tim Orr via Avo_ops 19 Dec '25

19 Dec '25

Associated Keywords: Elevated surface temperatures: barely elevated; Cloud cover: cloudy; Associated Keywords: Volcanic clouds: steam/water; Elevated surface temperatures: barely elevated; Cloud cover: partly cloudy; Cleveland: Moderately elevated temps seen in VIIRs mid-IR images. Normal-looking steaming at the summit in webcam views. Katmai: Still pretty dusty and hazy webcam views of the Katmai River valley from the KAB2 webcam. ____________________________________ To view these and other satellite data, please use http://volcview.wr.usgs.gov/ Duty person can be reached at (907) 786-7481 if you have any questions. Last image viewed: 19 Dec 2025 14:48 UTC _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO LOG- Seismic Summary - 12/18/2025
by logs--- via Avo_ops 19 Dec '25

19 Dec '25

Posted by: cheryl searcy (csearcy(a)usgs.gov), Fri Dec 19, 2025 18:53 (1853 UTC)-- "Significant" located earthquakes for December 18, 2025: (picking by Scott Stihler) Spurr: 9; Gareloi: 4; Cleveland: 3; Great Sitkin: 2; Iliamna: 2; Katmai: 2; Martin: 2; Westdahl: 2; Makushin: 1; Okmok: 1; Redoubt: 1; Shishaldin: 1; Snowy: 1; Davidof: 1 ======================== Spurr (9 EQs): 1 EQ ~16 km SSE of the summit ML 1.2; Z = 6.3 km 1 EQ ~2 km N of the summit ML 0.8; Z = -2.3 km 1 EQ ~4 km NNW of the summit ML 0.3; Z = 1.2 km 1 EQ ~11 km S of the summit ML -0.0; Z = 5.2 km 1 EQ ~4 km NNW of the summit ML -0.0; Z = -0.4 km 1 EQ ~4 km NNW of the summit ML -0.1; Z = 0.7 km 1 low frequency EQ ~2 km ESE of the summit ML -0.2; Z = 9.5 km 1 low frequency EQ ~5 km NNE of the summit ML -0.3; Z = -3.2 km 1 EQ ~3 km N of the summit ML -0.5; Z = -0.3 km Gareloi (4 EQs): 1 EQ ~25 km WSW of the summit ML 1.2; Z = 8.8 km 1 EQ ~4 km S of the summit ML 0.8; Z = 11.4 km 1 EQ ~8 km SSE of the summit ML 0.8; Z = 16.1 km 1 EQ ~5 km W of the summit ML 0.7; Z = 18.1 km Cleveland (3 EQs): 1 EQ ~10 km E of the summit ML 1.6; Z = 10.3 km 1 EQ ~10 km SSE of the summit ML 1.1; Z = 8.1 km 1 EQ ~2 km SSE of the summit ML 0.7; Z = 3.0 km Great Sitkin (2 EQs): 1 low frequency EQ ~3 km SW of the summit ML 0.3; Z = 5.0 km 1 EQ ~4 km WNW of the summit ML 0.0; Z = 4.8 km Iliamna (2 EQs): 1 low frequency EQ ~3 km ENE of the summit ML -0.3; Z = 7.4 km 1 EQ ~3 km NNE of the summit ML -0.8; Z = 1.9 km Katmai (2 EQs): 1 EQ ~1 km SSE of the summit ML 0.1; Z = 3.7 km 1 EQ ~4 km NW of the summit ML -0.2; Z = 2.0 km Martin (2 EQs): 1 EQ ~28 km SSW of the summit ML 0.2; Z = 15.2 km 1 EQ ~2 km NE of the summit ML -0.2; Z = 0.9 km Westdahl (2 EQs): 1 EQ ~4 km NW of the summit ML 0.5; Z = 1.8 km 1 EQ ~5 km W of the summit ML 0.4; Z = 4.9 km Makushin: 1 EQ ~20 km E of the summit ML -0.2; Z = 7.4 km Okmok: 1 EQ ~10 km S of the center of caldera ML -0.1; Z = 25.4 km Redoubt: 1 EQ ~8 km NNE of the summit ML -0.3; Z = 6.0 km Shishaldin: 1 low frequency EQ ~0 km WNW of the summit ML 1.3; Z = -0.9 km Snowy: 1 EQ ~17 km NNW of the summit ML 0.0; Z = 8.3 km Davidof: 1 EQ ~3 km E of the summit ML 2.0; Z = 2.9 km Attachments: This message is posted in the AVO Logs at https://www.avo.alaska.edu/admin/logs/posts/show/454451 _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO RSDB- 18 Dec 2025 satellite report
by Tim Orr via Avo_ops 18 Dec '25

18 Dec '25

Associated Keywords: Elevated surface temperatures: barely elevated; Cloud cover: cloudy; partly cloudy; Associated Keywords: Volcanic clouds: steam/water; Elevated surface temperatures: barely elevated; Cloud cover: partly cloudy; Associated Keywords: Volcanic clouds: steam/water; Elevated surface temperatures: moderately elevated; Cloud cover: partly cloudy; To view these and other satellite data, please use http://volcview.wr.usgs.gov/ Duty person can be reached at (907) 786-7481 if you have any questions. Last image viewed: 18 Dec 2025 14:37 UTC _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO LOG- Seismic Summary - 12/17/2025
by logs--- via Avo_ops 18 Dec '25

18 Dec '25

Posted by: cheryl searcy (csearcy(a)usgs.gov), Thu Dec 18, 2025 17:55 (1755 UTC)-- "Significant" located earthquakes for December 17, 2025: (picking by Scott Stihler) Iliamna: 4; Gareloi: 3; Makushin: 3; Takawangha: 3; Cleveland: 1; Novarupta: 1; Okmok: 1; Redoubt: 1; Spurr: 1 ======================== Iliamna (4 EQs): 1 EQ ~2 km SSE of the summit ML -0.4; Z = 5.6 km 1 EQ ~3 km ESE of the summit ML -0.5; Z = 3.3 km 1 EQ ~1 km NNE of the summit ML -0.6; Z = -2.5 km 1 low frequency EQ ~3 km N of the summit ML -0.8; Z = 0.9 km Gareloi (3 EQs): 1 EQ ~4 km NW of the summit ML 0.3; Z = 4.0 km 1 EQ ~3 km WNW of the summit ML 0.3; Z = 4.8 km 1 EQ ~1 km WNW of the summit ML 0.2; Z = 6.5 km Makushin (3 EQs): 1 EQ ~20 km E of the summit ML 1.4; Z = 8.5 km 1 EQ ~19 km E of the summit ML -0.1; Z = 7.3 km 1 EQ ~20 km E of the summit ML -0.1; Z = 7.3 km Takawangha (3 EQs): 1 EQ ~15 km E of the summit ML 0.3; Z = 7.4 km 1 EQ ~6 km E of the summit ML 0.1; Z = 5.1 km 1 EQ ~6 km E of the summit ML -0.1; Z = 4.3 km Cleveland: 1 EQ ~6 km S of the summit ML 0.9; Z = 13.8 km Novarupta: 1 deep low frequency EQ ~4 km NE of the 1912 dome ML -0.1; Z = 30.0 km Okmok: 1 EQ ~4 km SSW of the center of caldera ML -0.0; Z = 2.2 km Redoubt: 1 EQ ~4 km N of the summit ML -0.6; Z = 4.5 km Spurr: 1 deep low frequency EQ ~6 km SE of the summit ML -0.1; Z = 21.1 km Attachments: This message is posted in the AVO Logs at https://www.avo.alaska.edu/admin/logs/posts/show/454443 _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO RSDB- 17 Dec 2025 satellite report
by Tim Orr via Avo_ops 17 Dec '25

17 Dec '25

Associated Keywords: Elevated surface temperatures: barely elevated; Cloud cover: cloudy; partly cloudy; Associated Keywords: Volcanic clouds: steam/water; Elevated surface temperatures: barely elevated; Cloud cover: partly cloudy; Associated Images: https://www.avo.alaska.edu/admin/rsdb/files/show/62925 : 375mAKKA-MIR-d20251216t2101812212Z.png Associated Keywords: Volcanic clouds: ash signal; Cloud cover: partly cloudy; Cleveland: Barely to moderately elevated surface temps seen in several VIIRS mid-IR images over the past 24 hours. ____________________________________ To view these and other satellite data, please use http://volcview.wr.usgs.gov/ Duty person can be reached at (907) 786-7481 if you have any questions. Last image viewed: 17 Dec 2025 14:07 UTC _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO LOG- Seismic Summary - 12/16/2025
by logs--- via Avo_ops 17 Dec '25

17 Dec '25

Posted by: cheryl searcy (csearcy(a)usgs.gov), Wed Dec 17, 2025 18:37 (1837 UTC)-- "Significant" located earthquakes for December 16, 2025: (picking by Scott Stihler) Iliamna: 3; Spurr: 3; Takawangha: 3; Wrangell: 3; Cleveland: 2; Gareloi: 2; Fourpeaked: 2; Great Sitkin: 1; Kanaga: 1; Novarupta: 1; Redoubt: 1; Shishaldin: 1; Snowy: 1; Steller: 1 ======================== Iliamna (3 EQs): 1 EQ ~2 km E of the summit ML -0.7; Z = 0.1 km 1 EQ ~3 km NNE of the summit ML -0.7; Z = 2.0 km 1 EQ ~3 km S of the summit ML -0.7; Z = 1.0 km Spurr (3 EQs): 1 EQ ~28 km S of the summit ML 0.0; Z = 13.9 km 1 EQ ~4 km N of the summit ML -0.1; Z = -2.4 km 1 EQ ~5 km W of the summit ML -0.4; Z = 1.8 km Takawangha (3 EQs): 1 EQ ~6 km WSW of the summit ML 0.8; Z = 10.9 km 1 EQ ~6 km E of the summit ML 0.4; Z = 4.6 km 1 EQ ~6 km E of the summit ML 0.2; Z = 6.0 km Wrangell (3 EQs): 1 moderately deep low frequency EQ ~7 km WNW of the summit ML 0.5; Z = 16.3 km 1 moderately deep low frequency EQ ~7 km WNW of the summit ML 0.3; Z = 15.6 km 1 moderately deep low frequency EQ ~5 km WNW of the summit ML 0.0; Z = 14.8 km Cleveland (2 EQs): 1 EQ ~23 km SE of the summit ML 2.6; Z = 11.5 km 1 EQ ~2 km S of the summit ML 1.1; Z = 7.1 km Gareloi (2 EQs): 1 EQ ~8 km SE of the summit ML 0.8; Z = 7.5 km 1 EQ ~8 km NNE of the summit ML 0.7; Z = 9.2 km Fourpeaked (2 EQs): 1 EQ ~7 km W of the summit ML 1.6; Z = 8.6 km 1 EQ ~6 km SSW of the summit ML 0.9; Z = 3.0 km Great Sitkin: 1 low frequency EQ ~3 km WSW of the summit ML 1.2; Z = 1.0 km Kanaga: 1 EQ ~27 km SSE of the summit ML 0.9; Z = 2.1 km Novarupta: 1 EQ ~2 km SSE of the 1912 dome ML -0.1; Z = 2.7 km Redoubt: 1 EQ ~12 km NE of the summit ML 0.1; Z = 10.0 km Shishaldin: 1 EQ ~8 km SSW of the summit ML 1.3; Z = 6.1 km Snowy: 1 EQ ~13 km NW of the summit ML 0.1; Z = 4.3 km Steller: 1 EQ ~11 km NE of the summit ML 1.0; Z = 1.2 km Attachments: This message is posted in the AVO Logs at https://www.avo.alaska.edu/admin/logs/posts/show/454436 _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO LOG- Seismic Summary - 12/14/2025
by logs--- via Avo_ops 16 Dec '25

16 Dec '25

Posted by: cheryl searcy (csearcy(a)usgs.gov), Tue Dec 16, 2025 20:48 (2048 UTC)-- "Significant" located earthquakes for December 14, 2025: (picking by Cheryl Searcy) Iliamna: 4; Katmai: 2; Cleveland: 1; Okmok: 1; Snowy: 1; Trident: 1; Steller: 1 ======================== Iliamna (4 EQs): 1 low frequency EQ ~13 km ENE of the summit ML 0.0; Z = 9.4 km 1 EQ ~3 km S of the summit ML -0.2; Z = 1.5 km 1 EQ ~6 km SSE of the summit ML -0.5; Z = 0.4 km 1 EQ ~2 km SSW of the summit ML -0.7; Z = 0.4 km Katmai (2 EQs): 1 EQ ~10 km NNE of the summit ML 0.4; Z = 3.7 km 1 EQ ~3 km WNW of the summit ML -0.0; Z = 3.2 km Cleveland: 1 EQ ~4 km ENE of the summit ML 1.1; Z = 10.7 km Okmok: 1 EQ ~5 km WNW of the center of caldera ML 0.5; Z = 3.3 km Snowy: 1 EQ ~5 km NW of the summit ML 0.1; Z = 5.6 km Trident: 1 EQ ~1 km NW of the summit ML -0.3; Z = 6.5 km Steller: 1 EQ ~28 km N of the summit ML 0.3; Z = 7.2 km Attachments: This message is posted in the AVO Logs at https://www.avo.alaska.edu/admin/logs/posts/show/454433 _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO RSDB- 16 Dec 2025 satellite report
by Tim Orr via Avo_ops 16 Dec '25

16 Dec '25

Associated Keywords: Elevated surface temperatures: barely elevated; Cloud cover: cloudy; partly cloudy; Associated Images: https://www.avo.alaska.edu/admin/rsdb/files/show/62924 : 375mAKSH-MIR-d20251216t1225910752Z.png Associated Keywords: Volcanic clouds: steam/water; Elevated surface temperatures: barely elevated; Cloud cover: partly cloudy; Associated Keywords: Cloud cover: partly cloudy; Cleveland: Weak thermal anomaly in a couple VIIRS mid-IR images over the past 24 hours. Gas emissions were barely visible in the few clear webcam images available. To view these and other satellite data, please use http://volcview.wr.usgs.gov/ Duty person can be reached at (907) 786-7481 if you have any questions. Last image viewed: 16 Dec 2025 14:25 UTC _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO LOG- Seismic Summary - 12/15/2025
by logs--- via Avo_ops 16 Dec '25

16 Dec '25

Posted by: cheryl searcy (csearcy(a)usgs.gov), Tue Dec 16, 2025 03:01 (0301 UTC)-- "Significant" located earthquakes for December 15, 2025: (picking by Scott Stihler) Fourpeaked: 4; Great Sitkin: 3; Little Sitkin: 2; Novarupta: 2; Cleveland: 1; Gareloi: 1; Iliamna: 1; Katmai: 1; Redoubt: 1; Spurr: 1; Takawangha: 1; Trident: 1; Steller: 1 ======================== Fourpeaked (4 EQs): 1 EQ ~8 km W of the summit ML 1.6; Z = 6.0 km 1 EQ ~8 km WSW of the summit ML 0.8; Z = 4.0 km 1 EQ ~9 km WSW of the summit ML 0.7; Z = 5.3 km 1 EQ ~8 km WSW of the summit ML 0.4; Z = 6.2 km Great Sitkin (3 EQs): 1 EQ ~4 km WSW of the summit ML 0.6; Z = 4.2 km 1 EQ ~5 km NW of the summit ML 0.4; Z = 4.0 km 1 EQ ~3 km SW of the summit ML 0.2; Z = 1.8 km Little Sitkin (2 EQs): 1 EQ ~1 km E of the summit ML 0.5; Z = 5.8 km 1 EQ ~7 km WNW of the summit ML 0.2; Z = 6.3 km Novarupta (2 EQs): 1 EQ ~8 km NNW of the 1912 dome ML -0.2; Z = 11.6 km 1 low frequency EQ ~3 km WNW of the 1912 dome ML -0.6; Z = 8.6 km Cleveland: 1 EQ ~21 km SE of the summit ML 2.1; Z = 19.6 km Gareloi: 1 EQ ~3 km WNW of the summit ML 0.7; Z = 7.5 km Iliamna: 1 EQ ~3 km NNE of the summit ML -0.9; Z = -1.1 km Katmai: 1 EQ ~2 km WNW of the summit ML 0.7; Z = 2.7 km Redoubt: 1 EQ ~4 km NNE of the summit ML 0.2; Z = 6.6 km Spurr: 1 EQ ~18 km S of the summit ML 0.1; Z = 5.9 km Takawangha: 1 EQ ~6 km E of the summit ML 1.0; Z = 4.3 km Trident: 1 low frequency EQ ~3 km WSW of the summit ML -0.3; Z = 7.5 km Steller: 1 EQ ~24 km N of the summit ML 2.2; Z = 10.3 km Attachments: This message is posted in the AVO Logs at https://www.avo.alaska.edu/admin/logs/posts/show/454427 _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0

[AVO-OPS] AVO LOG- AVO Meeting notes for December 15, 2025
by logs--- via Avo_ops 15 Dec '25

15 Dec '25

Posted by: (), Mon Dec 15, 2025 20:46 (2046 UTC)-- AVO Meeting notes for December 15, 2025 Great Sitkin: Orange Shishaldin: Yellow Acting SIC: Matt Loewen Acting CS: Ronni Grapenthin Duty Scientist: Tim Orr Duty Remote Sensor: Tim Orr Duty Seismologist: John Lyons CNMI duty seismologist: John Lyons CNMI Remote Sensor: Tim Orr Primary alarms: John Lyons Secondary alarms: Tim Orr AVO radio: Abbey Nastin DUTY SCIENTIST REPORT– Chris Waythomas + GREAT SITKIN (Orange/Watch): • The eruption continues, but seismicity and effusion are low. • A report from Reston on December 12 indicated effusion was ongoing to the south side of the dome, and the southeast half of the dome appears to still be inflating • Satellite views intermittently clear throughout the week revealing barely elevated surface temperatures on December 9, 10, 13, 14. + SHISHALDIN (Yellow/Advisory): • Unrest continues like the past weeks. Elevated LP and infrasound activity throughout the week, but infrasound detections obscured by high winds much of the week • Steaming observed in web camera images all week. • No evidence of elevated temperatures in satellite data, except possibly on December 9. This was likely due to hot emissions and not lava effusion. • AAWU issued a SIGMET Saturday morning (December 13) to say that resuspended ash was evident seen in satellite images. High winds were generating plumes of dust visible in satellite imagery Saturday (12/13) and Sunday (12/14). Dust plumes were also visible extending from Westdahl and other volcanic areas along the Alaska Peninsula. + KATMAI (Green/Normal): • Information Statement on resuspended ash issued on December 12 (Friday). + CNMI/AHYI: • Nothing observed all week • No Wake Island detections last week. NET OPS/FIELDWORK: Ellie Boyce Color Code: Great Sitkin – All stations working. Shishaldin – All stations working except some SSBA data gaps. Network, Multi-Station and Array Outages: --Port Heiden (#aniakchak, #veniaminof (north side) - 2025-12-13 07:07:08 UTC Power outage, details unknown at this point. Single Station Issues -Wrangell – WAZA out since Saturday afternoon. Tolsona sites continue to have data gaps at IRIS. AVO Winston copy complete. -Iliamna – ILLG remains out, ILSW power getting low. -Augustine – AUW data gaps last week -Shishaldin – SSBA/AV38 and ISNN/AV38 low power, GNSS powered off at both stations to conserve power for seismic data. -Westdahl – WECS seismic offline to conserve power for GNSS and radios. -Akutan -LVA out due to low voltage. -Okmok – OKAK and OKWE no telemetry. -Bogoslof – BOGO completely out last week, it was on back on briefly on 11/12 and 11/13. -Adak – Infrasound element 6 is not working and element 2 reported as having reversed polarity. -Little Sitkin -Gappy data and outages from LSNW and LSSA probably due to icing on LSSA radio antennas. OPEN ANNOUNCEMENTS + ADGGS – Scott Crass • All are in this week • Scott has been working on getting samples sent from the University of Wisconsin shipped to the DMC. • Ian Brewster is here this week but out next week and the week after. • Hiring is complete for the Geologist 4 position. Janine Andress begins April 22. + UAF – Ronni Grapenthin • There is a small crew at UAF this week with folks at AGU. • David Fee returns Dec. 27. Ronni is acting until the afternoon of Dec. 22 then Jess Larsen takes over until David’s return. • The current deadline for the BV Shishaldin special issue is January 1 but will likely get bumped into the Spring. If your publication plans have changed, please let Ronni Grapenthin, Matt Loewen or Taryn Lopez know. + USGS – Matt Loewen • If you are attending the CoMeet in Fairbanks please check the spreadsheet and make sure your information is correct. • The new duty schedule has been emailed out. • Dave Schneider led a duty scientist meeting following the staff meeting to go over the new VONA format. • Charles Olin will be on annual leave the week Christmas. • Matt Loewen will be on annual leave the week of Christmas and the next week. Attachments: This message is posted in the AVO Logs at https://www.avo.alaska.edu/admin/logs/posts/show/454426 _______________________________________________ Avo_ops mailing list -- avo_ops(a)list.avo.alaska.edu To unsubscribe send an email to avo_ops-leave(a)list.avo.alaska.edu

1 0